Conduit.



E. L. BARNES.

GONDUIT.

APPLIGATION FILED HAE. 16, 1908.

' Patented May 11, 1909.

" 2 SHEETS-snm 1.

6.... n.. .......w K. mmf/ Amhl] Patented May 11, 1909.

Z SHEETS-SHEET 2.

/zvenfor E. L'. BARNES.

UONDUIT.

E 17e/zel. arhes APPLIUATION FILED MAB.. 16, 1908.

i d f Y secured together by a lwinding of wire.

"UNrrEn srATEs PATENT oEEIcE.

EUGENE L. BARNES, or DETROIT, MICHIGAN.

Patented May 1 1, 1909.

CONDUIT.

No. 921,061. y specification of Lettere Patent.

Application flled March 16, 1908. i Serial No. 421,546.

To all whom it may concern:

Beit known that I, EUGENE L. BARNES, a citizen of the UnitedStates of America, residmg at Detroit, in the county of Wayne and State of Michigan, have invented certain new and useful Improvements in Conduits, of which the following is a speciiication, reference being had Vtherein to the accompanying drawings.

The invention relates to a construction of heat insulating conduits more particularly designed for the protection of underground steam pipcs, and 1t is the principal ob ject of the invention to obtain a construction which is high in its heat insulating properties.

It is a further object of the invention to obtain a construction which will afford a firm support for the steam pipe, vor other inner con uit, and will also permit the free movement of said pipe 4to compensate for. expansion and contraction.

Still further, it is an object to obtain a construction which is simple to manufacture and` is easily placed in position.

With these objects in View, the invention consists in the construction as herein after set forth.

In the drawings-Figure 1 is a longitudinal section through a portion of the conduit; Fig. 2 is a cross section in the meeting plane f of the two conduit sections illustrating the construction of the coupling member; Fig. 3 is a cross section through one of the sections of the conduit Nin the plane of the spacing ring; Fig. 4 is a perspective view of a portion of one end of the conduit with the outer casing partly broken away.

In the present state of the art heat insulatingconduits for 'steam pipes have been formed of wooden staves assembled as a jacket about the conduit to be protected rpd e wood is 'a fairly good heat insulator, and if the staves are held tightly together good results may be obtained. It has been found, however, that the binding wire, which holds the staves together, will soon corrode wh'en the conduit is buried in the ground, and that the expansion and contraction due to the absorption of moisture b the wood when the conduit is cold, and the rying out when it is hot, will often cause the opening up of the jacket. Furthermore, the wood is not as -ings for these staves.

the other substances are in a dead air s ace.

With my improved construction, thc e ectiveness of the insulation is greatly increased, first, by a construction of stave jacket which will not ermitthe openin u of the seams, and furt er by formmg a o ow jacket, the space between the inner and outer walls of which is either a dead air space or filled Witha substance which is higher in insulating properties than the wood.

As illustrated my improved conduit is formed in sections A which ma be successively sleeved upon the conduit to be rotected. Each section A is com osed o an outer casing formed of staves B and an inner casing also formed of staves C. These casings are secured in ixed relation to each other by intermediate spacing rings D which, as illustrated, are of a channel section, the [langes beinylaJ turned inward'. The rings D are preferab y split at one point and are provided with lugs D for engaging with clamping bolts E so that the rings may be secure y clamped about the inner staves C to hold them to ether. The outer staves B B are preferably formed so as to interlock with each other and the outer faces of the rings D are preferably polygonal to form flat bear- The staves B are secured in place by bolts F which engage with apertures G in the rings and pass through the same and through a registering aperture 1n the stave. The clamping nuts H engage the outer ends of the bolts and are preferably) located in a recess I in the stave and ear against a washer J. The staves B alternate with the staves B and have a dovetail engagement therewith so that they are secure from displacement by the same bolts F. These staves B are further secured by engagement with outwardly rojecting lugs or pins K on the rin s D whic hold them from ongitudinal dis acement. There is also preferably Iprovi ed a tongue and roove engagement between the vstaves B so that if the wood shrinks to o en the seama tight joint is still maintaine by the engagement of the tongue with the groove.

The staves of the inner casing are shorter than those of the outer casing, and are arranged to leave a projecting portion Mv of the outer casing at each end thereof. Thus the high in its heat insulating properties as when' ends of the inner casing in adjacent sections are spaced from each other, and this space is filled byv the coupling member O. This cou ling performs the further function of a mec anical support for the conduit to be protected and to provide for the movement of said conduit in expansion and contraction a roller bearing is employed. This, as shown, consists of a grooved roll P arranged to form separated bearings P and P2 for the inner conduit, which latteris spaced from the inner casing formed by the staves C and is centered in relation thereto. The roll P is provided with journals at opposite ends thereof which engage with bearings in lugs R projecting inward from the coupling member O. This coupling member is preferably formed of cast metal of polygonal form to iit within the projecting ortion M of the outer staves. This is also re erablyprovided with inwardly jrojectinglanges O at op osite ends thereof.

hespace between these anges, with exception of that occupied by the roll P, is preferably lled with some heat insulatin@` substance S, which is retained in position by an inner sheet metal casing S. Y

In laying the conduit, as each section of the inner pipe or steam conduit is placed in position, it is inca-sed by sleeving the sections A of the, insulating conduit thereon, and

these sections are joined to each other by the coupling members O. The joint between the abutting ends of the outer casings may be protected by a wrapping T of tar paper, felt or other Waterprooi material, and thus a Water-tight case is formed. When in ositionvthe inner conduit is supported entlrely by resting upon the rolls P so that no stress is placed upon the inner casing, and furthermore this casing is separated from the metal of the inner conduit by a space, either a dead airgspace or filled with heatinsulating materia It will be observed that the only solid heat conducting material between the outer and inner walls f the sections A is the metal in the flanges of the rings D and the contacting surface-of these flanges upon the inner staves is so restricted as to permit very little heat conduction. It will be further observed that the conduit toA be rotected has no contact with the inner wa l of the sections and rests practically upon point bearings and the rolls so that loss of heat bv conduction through these rolls is very small. Thus the heat insulating eliciency of the conduit as a whole is very high.

What I claim'as my invention is:

1. A heat insulating conduit comprising inner and outer casings, each composed of a series of staves, a ring intermediate said casings forming a clamp for the inner staves, and a spacer between said casings, and means for securing the outer staves to said ring.

Aand outer casings, t

2. A heat insulating conduit comprising inner and outer casings, the inner casing being composed of a series of staves, an adjustable ring intermediate said casings forming a clamp for the staves of the inner casing and a spacer between said casing, and means for securing the outer casing te said ring.

3. A heat insulating conduit comprising inner and outer casings, each composed of a series of staves, a split clamping ring for binding together the inner staves and for spacing the outer staves therefrom, and bolts anchored in said ring for clamping the outer staves thereto.

4. A heat insulating conduit formed of inner and outer casings sleeved upon the inner conduit to be protected and coupling members for said sections forming the supporting bearings for said inner conduit.

5. A heat insulating conduit formed of sec- -tions sleeved upon the inner conduit to be protected, coupling members for said sections, and roller bearings in said coupling members for mechanically supporting the inner conduit.

6. A heat insulating conduit com rising sections, each com osed of separate inner e outer casing projecting beyond the ends of the inner casing and a coupling member for adjacent sections fitting within the projecting lportions of said outer casing and between t e ends of said inner casing.

7. A heat insulating conduit com rising sections, each composed of an inner an outer separated casing, the outer casing projecting beyond the end of the inner casing, and a coupling member for adjacent sections :fitting within the outer casing, and having a roller bearing therein for mechanically supporting the conduit to be protected.

8. A heat insulating conduit comprising adjacent sections, and a cou ling member for said sections, consisting o? an inwardly flanged drum, a supporting roll for the conduit to be protected journaled in said drum and heat insulating material between the langes of said drum.

9. A heat insulating conduit comirising spaced inner and outer casings, each ormed of a series of staves and a spacing ring forming a bearing for the outer staves having an inwardly extending flange forming a bearing of restricted contacting surface for the inner staves, and means for securing said outer staves to said ring.

`l0. A heat insulating conduit coml rising separated inner and outer casings, eac 1 composed of a series of staves, a spacing ring of channel section having its flanges extending inwardly and bearing upon said inner staves,

and clam ing bolts for said outer staves having their eads anchored within the channel of said ring.

11. A heat insulating conduit formed of a mediate said casings forming a clamp ,for the series of staves havin a tongue and groove x inner staves and a spacer between said casengagement with eac other vat their side i ings, and means for securing the outer staves edges, and a ring within said conduit to which i to-said ring.

said staves are clamped. i In testimony whereof I affix my signature 15 12. A heat insulating conduit com rising g in presence of two Witnesses. inner and outer se arated casings eac comi EUGENE L. BARNES. posed of a series o staves, the staves of theil Witnesses: outer casing havin a tongue and grootfe en- N ELLIE KINSELLA,

10 gagement with eac other, and a ring interil JAMES P. BARRY. 

